Homebrew PCBs

If you are in the USA, you could put in for a stimulus grant for additional 
gravity in the area of your hot plate :)

Otherwise, I'd look at the preheat.  Sounds like there is still moisture in the 
paste.

Donald.

Jim Lewis wrote:
> I have a problem with SMT chips jumping off the board during reflow. I preheat for 2.5 minutes 1/4" above the hot plate and then reflow 1.5 minutes directly on the hot plate at 375F with a cover. Paste is from Stencils Unlimited. Any solutions?
>